Congrats
Not sure why RAM access is 100% ? Possible the overhead from the extra resolution causing it ? I guess only way to find out is to do the DE mod.. Though still would expect RAM to be 200%.. The CPU is running at double speed with the MMU & RAM, so bit odd that.
I never checked the sync of the 161, looks to clock on the rising edge and says rising in the pdf after a quick look, your LA seem to clock on the 32mhz HI, so would seem to be all correct I think , glad it proved it could work though! I can add that into the next booster logic now I know it works
This probably GB3, even so...
.. I don't think its routines would "fake" 200%... GB6 has much better routines, but don't think it would be 100% "out"...
Half asleep here, but my first thought is the MMU would trigger DTACK double speed, CPU would read at double speed.. nothing to generate waitstates unless the CPU totally missed DTACK for ages. Even if it missed by half a clock cycle, would still expect 150% or more.
So my initial thought is the extra resolution must be hogging MMU time with display updates, and lowering the RAM speed test back to 100%..
Wonder if you could simply load GB6, and disconnect the DE signal, screen will not update of course, but if you leave the signal disconnected (tie to 0v) just for testing, press "A" to run all tests, then wait a couple of moments, and reconnect DE , then you can see the results.. might even get 400% then Idea being just to "turn off" the shifter requesting MMU time..
Boosting STFM: 16MHz bus, 64MHz Shifter
Re: Boosting STFM: 16MHz bus, 64MHz Shifter
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Re: Boosting STFM: 16MHz bus, 64MHz Shifter
So I'll just leave this here ...
Re: Boosting STFM: 16MHz bus, 64MHz Shifter
God like!, 16 colours in medium res!
EDIT, oh nope, its actually higher than medium res!
Also 1280 x 400 2 colours
EDIT2:
hold on, how did we get from extra res to extra colours as well ???
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Re: Boosting STFM: 16MHz bus, 64MHz Shifter
All horisontal resolutions become double
low: 320x200x16 -> 640x200x16
medium: 640x200x4 -> 1280x200x4
high: 640x400x2 -> 1280x400x2
(I don*t think the higher resolution should lower RAM speed btw, the MMU always interleaves CPU/Shifter access to memory no matter if DE is high or not. So, I do think the CPU stalls every second RAM access or so .. but .. that's for another day Now I'm going to be a bit happy about the new video modes. My idea to patch the old overscan3 sources worked out fine after having debugged a bug that showed up for our resolutions)
/Troed
Re: Boosting STFM: 16MHz bus, 64MHz Shifter
ahh makes sense nowtroed wrote: ↑Wed Oct 11, 2017 9:57 pm
All horisontal resolutions become double
low: 320x200x16 -> 640x200x16
medium: 640x200x4 -> 1280x200x4
high: 640x200x2 -> 1280x400x2
(I don*t think the higher resolution should lower RAM speed btw, the MMU always interleaves CPU/Shifter access to memory no matter if DE is high or not. So, I do think the CPU stalls every second RAM access or so .. but .. that's for another day Now I'm going to be a bit happy about the new video modes. My idea to patch the old overscan3 sources worked out fine after having debugged a bug that showed up for our resolutions)
/Troed
Yes, pat on the back to you for sticking with it and getting it working! You have a machine to get started with the software, that's the main thing. Leave the screwy booster stuff to me to figure out another day
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Re: Boosting STFM: 16MHz bus, 64MHz Shifter
Impressive !
Working ones : MegaSTE (68020) / TT030 / Falcon with AB040 & Eclipse / 1040STF
Need testing : Falcon with CT2
Need testing : Falcon with CT2
Re: Boosting STFM: 16MHz bus, 64MHz Shifter
NICE!
Now for the important stuff; has V-sync pulsewidth changed? Do I need to update some code for the ubeswitch?
Now for the important stuff; has V-sync pulsewidth changed? Do I need to update some code for the ubeswitch?
master of the bare pcb
Re: Boosting STFM: 16MHz bus, 64MHz Shifter
Tests run with the latest GEMbench 6 - it's great to see programs not checking video mode ("low") but the fact that the resolution (640*200 - although there seems to be an off-by-one error in the detection) is good enough to run
I'm still sure RAM should be 200% once everything has been tuned correctly, but it's great to see the increased color depth doesn't have a huge impact on performance. A booster that includes these video modes will probably make 640x200x16 the most popular mode I think.
@ube - GLUE still runs at 8MHz so nothing should've been changed when it comes to video timings. I'm currently using the previous version with physical mono/color switch, will change to the new one but I'm sure it works fine.
/Troed
I'm still sure RAM should be 200% once everything has been tuned correctly, but it's great to see the increased color depth doesn't have a huge impact on performance. A booster that includes these video modes will probably make 640x200x16 the most popular mode I think.
@ube - GLUE still runs at 8MHz so nothing should've been changed when it comes to video timings. I'm currently using the previous version with physical mono/color switch, will change to the new one but I'm sure it works fine.
/Troed
Re: Boosting STFM: 16MHz bus, 64MHz Shifter
Woah...
Ingo
| Atari 1040STE@32MHz | Amiga 1200 (ACA1220) | Atari 800XL (U1MB, SIDE2) | Atari 130XL (Sophia DVI) | C64 (1541 Ultimate II, Rev3 RFMod Replacement) | TI 99/4A (F18A, 32k, FlashROM 99) | Sinclair ZX Spectrum 128 (Stereo, DivMMC) | Amstrad CPC664 (512k, M4 Wifi) | ... |
| Atari 1040STE@32MHz | Amiga 1200 (ACA1220) | Atari 800XL (U1MB, SIDE2) | Atari 130XL (Sophia DVI) | C64 (1541 Ultimate II, Rev3 RFMod Replacement) | TI 99/4A (F18A, 32k, FlashROM 99) | Sinclair ZX Spectrum 128 (Stereo, DivMMC) | Amstrad CPC664 (512k, M4 Wifi) | ... |
Re: Boosting STFM: 16MHz bus, 64MHz Shifter
Wow, cool stuff Troed. Really impressive how such an easy (relatively speaking) mod can do so much. I wonder why nobody has similar idea for decades?